Power shovel



3 1927' A. RUSSELL POWER SHOVEL Aug. 16 5 Sheets-Sheet 1 1927' L. A. RUSSELL POWER SHOVEL Filed Aug. 16. 1923 5 Sheets-Sheet z. amen 3% Elm up Aug. 23, 1927.

L. A. RUSSELL POWER SHOVEL Filed Aug. 16, 1923 Wzbwas WW 55 ence to which and the following Patented Aug. 23, 1927.

UNITED STATES PATENT OFFICE.

LESLIE A. RUSSELL, OB MILWAUKEE, WISCONSIN, ASSIGNOB TO KOEHRING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION.

rowan sHovEL.

Application filed August 16, 1923. Serial No. 657,818.

This invention has to do with locomotive cranes of the type employed for the support and operation of power shovels.

The invention has for its primary object the designing of novel cable thrust instrumentalities for controlling the crowding out and racking in of the shovel or dipper. In the carrying out of this feature of the in vention, I utilize a specially devised operab ing drum in conjunction with peculiar, novel mechanism for actuating said drum in reverse directions in order to in turn impart corresponding movements to an operating cable by which the crowding out and rack- 1 ing in of the dipper or shovel are compelled. By the use of my reversibly operated drum I am enabled to utilize a drum actuator of simple construction, and I employ in conjunction therewith peculiar planetary gear- 2 ing which enables the reverse ogeration of the drum to be quickly efiecte together with other features of construction especially advantageous for the purposes re ferred to.

Another feature of my invention resides in a peculiar provision for mounting the boom of the crane on the body thereof, the said provision including a peculiarly constructed bracket by which the foot of the boom is pivotally connected with the swing body of the crane. By this means I dispense with the use of guy rods for bracing the boom against lateral stress and vibration. Of greater importance however, the construction of the mounting of the boom on the crane body permits of an arrangement of pulleys at the foot of the boom enabling the rackln in and thrusting out cable means to travel 1n a ath substantially intersecting the axis of t e boom. On this account I am enabled to peak the boom in and out during the racking in and crowdin out of the shovel without varying the tension upon the thrusting or driving cable which leads from the operatin drum on the crane body to the shipper s aft on the boom of the shovel.

Another feature of my invention resides in certain novel adjustlng means for the thrusting cable to take up: slack therein, it

being remembered that t e thrust of said cable in one direction controls a rackin in of the di er, and an opposite thrust e acts the crow mg out of the same.

In the accompanying drawings on referdescription a full understanding of the invention will be had, the figures may be briefly described as follows:

Figure 1 is a top plan view, certain parts shown in section, illustrating rimarily the boom structure, and the cable t rust operating mechanism.

Figures 2 :1nd'2 are a combination side elevation view of the whole machine.

Figure 3 is a view of certain of the connecting lever and link parts intermediate the main cable thrust control lever, and the clutches which are controlled thereby.

Figure 4 is a side view showing more fully the brake means which coacts with the planetary gearing clutch mechanism.

Figure 5 is a plan view bringing out more clearly the parts illustrated in Figure 4 and Figure 3.

Figure 6 is a sectional viewof the planetary reversing gearing.

For the purposes of the present description the details of the crane construction which I illustrate are not very material, since I may utilize different crane constructions so far as the traction base and swing body features are concerned. I shall, therefore, only generally describe my crane in conjunction with Figures 2 and 2*, wherein it will be seen that in its embodiment as a power shovel I em loy the traction base A supporting the swing body or car B, said swing body being largely of generally well known construction, and supporting thereon the boom C by which the shovel means including the dipper handle 1 and the dipper 2 are carried. On the swing body B is a bucket.hoist drum 3, about which the bucket hoist cable or line 4 may wind'or unwind as conditions .of operation require. A boom hoist drum not clearly shown in Fig. 2. but having a boom hoist cable 5 adapted to wind and unwind relative thereto, may be utilized for controlling the adjustment of the boom inwardly and outwardly in respect to the swing body B. As seen best in Figures 1 and 2", the boom C is supported at its lower end in a pivotal manner by means of the downwardly and laterally diverging brackets 6, pivotally connected at 7 with arms 8 projecting from the ad'acent end of the swing body B. The brac ets 6 materially diverge in relation to one another or incline outwardly from the adjacent sides of the boom C. y this construction of bracket supporting means for the boom, I obtain a strong mounting of the boom on the swinging body, a mounting which obviates any tendency of the boom to sway laterally, and one which is adapted to permit of ready adjustment of the boom by lvotal up and down movement. The brac ets 6 are not only ivotal connections, but are effective latera braces as designed for the purposes On the boom C there is carried the shlpper shaft supporting brackets 9 substantially secured in a ri id manner to opposite sides of the boom pre erably, and formed with guideways 10 disposed longitudinally of the boom and receivin sliding journals 11 movable sideways of t e guideways 10 in the brackets 9. The shipper shaft 12 is mounted in the journals 11 and carries the shipper drum 13 about which the thrustin cable 14 is wound in opposite directions rom points at the ends of the drum toward the center. The shipper drum 13 is, of course, keyed to the shaft 12, and there are also keyed to the said shaft the crowding out and racking in pinions 15, seen best perhaps in Fig. 1. The pinions 15 engage with racks 16 on the spaced sides of the dipper handle 1, in a well known manner, an the dlpper handle itself is received by saddle blocks 17 carried by the shipper shaft 12, in the well known manner also, said blocks 17 being pivotally mounted on the shaft 12. Mounted on the boom C between the supporting means for the shipper shaft and t e brackets 6, are devices for performing the function of taking up slack in the thrustinfg cable 4. These devices may take different orms but that illustrated in Figure 1 and 2 may be characterized as consistin of a pair of actuating shafts 18, supporte intermediate their ends in suitable bearin brackets 19 on the boom, and engaged at t eir upper ends with the journals 11.. The shafts 18 may be said to constitute screw shafts, being equipped at their lower ends with screws 20 received by screw openings of worm gears 21, see Fig. 2*, with which worm gears engage worms 22, see Fig. 1, the latter being carried by a shaft 23. The shaft 23 is turnable by handle means 24, and when operated in a suitable direction will impart longitudinal movement to, the screw shafts 18, causing the latter to force upwardly relativel 'to the s boom 0, the journals 11 of the she t 12, to

thereby take up slack in-the cable 14, in a manner obvious from the foregoing.

Coming now to the cable thrust mechanism by which the dipper 2 is racked in and crowded out I refer particularly to F1 1, 3, 4, and 5. From these figures it will observed that I provide on the swing body B on which the power plant for operating my shovel is mounted, the crowding out and racking in drum 26. This drum which is neaepsa a main operating drum for controlling the dipper, in conjunction with the bucket or dipper hoist mechanism, has the ends of the thrusting cable 14 wound thereabout in opposite directions, and from points at the ends of the drum toward the middle. The purpose in winding the cable 14 about the drum 26 in the above manner and the correspond ing winding of the cable around the shipper drum 13, is to enable one portion of the cable as it winds on the drum to enter and occupy the space of the other portion which unwinds from the drum. The said space on the drum about which the cable w nds may be spirally grooved, as shown incidumally in ig. 1.

From the points where the cable 14 passes from opposite sides of the drum 26, the two portions of the cable pass beneath loose pulleys 27 carried by brackets 28 at the heel of the boom C the brackets 28 may be secured to the boom pivoting brackets, may be parts thereof, or may be attached to the boom sep arately, these several things being immaterial within the purview of the invention. After passing beneath the pulleys 27 the spaced lparts of the cable 14 lead upwardly along t e boom C to the shipper drum 13, and are wound about said drum 13 in opposite directions in the manner previously de-- scribed.

From the fore oing, it will be apparent, owing to the pecu iar method of winding the cable 14 about the drums 26 and 13, a turning of the drum 26 in one direction as an operating member or device will compel a revolution of the shipper drum 13 in one direction, anda reverse turning of the drum 26 will effect a corres ending reverse movement of the drum 13. s the turning of the drum 13 in a clockwise direction causes the crowding out of the dipper 2, and the rotation of the drum 13 in a contraclockwisc direction will result in a racking in of the dipper 2, I desire to,employ means co-operative with the opera g drum 26 to turn it in said two directions. These means will now be set forth. The dr 26 is mounted upon an operating shaft 30 which shaft is adapted to be driven from e en ine or motor on the swing body B thru suita le gearing which forms no part of the present invention. The said gearing includes a main gear 31 which is keyed to the shaft 30. The gear 31 may be a constantly operating gear. or one which may be set into motion at will under the influence of any suitable clutch mechanism for driving it from the main powerv plant. To drive the drum 26 fromthe gear 31, I utilize any suitable clutch means. In the present instance said clutch means includes a clutch collar 32 on the shaft 30 and connections between said collar and the main operating lever 33, see Fig. 4. These connections may include a rocking lever 34, rod 35, above the swing til.

Lil

body, and a lever 36 and links 37 beneath the swing body, all suitably connected by linkage of some sort. Between the gear 31 and the ad'acent end of the drum 26 is a clutch which may include a clutch band orbands 36 surrounding the adjacent end of the drum 26 and operable by suitable toggle levers and linkage connections from the gear 31, the said toggle features operated by the sleeve or collar 32 being shifted inwardly or outwardly on the shaft 30. Then by the operation of the lever 33 in the manner just mentioned, by shifting to the left from its neutral position of Fig. 4. the clutch devices including the clutch band 36*, will operatively connect the gear 31 to the drum 26 and turn the drum so as to actuate the cable 14 to rotate the shipper drum 13 clockwise, whereby a crowding out of the dipper 2 is compelled.

I provide a suitable means for reversing the operation of the drum 26 in order to cause a racking in movement of the dipper 2. The said means is under the control of the same lever 33 by which the clutch de vices just described are operated. Referring to Fig. 1, and Figs. 4 and 5. it will be noted that the end of the drum 26 opposite that having the clutch band 36 applied thereto is hollow and equipped with an internally toothed gear 37 secured thereto in any suitable and substantial manner. This gear engages a series of pinions 38 mounted on a brake drum 39 loose on the shaft 30. Around the brake drum 39 extends a brake band 40, see Fig. 4, and intermediate the brake drum 3.) and the adjacent end of the drum 26 is the drive gear 41. \Vhile the drum 39 and the drum 26 are loose on the shaft 30, the drive gear 41 is keyed to 'said shaft as shown clearly in Fig. 1; By using the brake Land 40 and the parts 37, 38, 39, and 41, I obtain a planetary gearing which acts as a clutch to connect and operate the drum 26 from the shaft 30, but driving it in a direction opposite to the direction in which it is driven by the gear 31 and clutch means be tween said gear 31 and the drum 26. For the operation of the planetary gear clutch mechanism I utilize the lever 33. as before mentioned, said lever being connected at its lower end, as seen best in Figs. 4 and 5, by slotted yoke 42 and bars 43 to a bell crank lever 44. The lever 44 is connected by a rod 45 to a similar lever 46 and the latter is connected by a rod 47 to another bell crank lever 48. The lever 48 is connected by a rod 49 to the connecting member 50 attached to one end of the brake band 40. A spring 51 tends to release the brake 40 from the drum 39. Another spring 52 acts on the bar 43 and adjacent parts to normally hold the lever 33 at neutral. The parts 42 and 37 are slotted as shown in Fig. 4, at 42 and 37' respectively, so that there may be some play or movement of the lever 33 before operation of the planetary clutch means for reversing the operation of the drum for racking in purposes.

From the foregoing, itwill be apparent that a shifting of the lever 33 to the left, as seen in Fig. 4, will cause operation of the several clutch shifting parts 32, 34, 35, etc., whereby to operativcly connect the gear 31 to the drum as so as to drive the drum 26 at its lower of two speeds, namely at the same speed as the shaft 30, for crowding out the shovel or dipper :2. As soon as the crowding out operation has been performed, and racking in of the dipper 2 is required, the lever 33 may be carried to neutral position and beyond such position to the right of its adjustnient according to Fig. 4, exerting a pull on the connections 42 to 49 inclusive, and thus applying the brake band 40 to the drum 39. Previously the drum 39 has been freely rotating with the driving gear 41 and the gear 37 of the drum 26 being locked to the drum 26 for such rotation by the pinions 38. As soon, however, as the brake drum 39 is stopped from rotation by the application of the brake band 40, the pinions 38, which have been previously rotating bodily in a circular path, have such movement discontinued. Thereupon the driving gear 41 keyed to the shaft 30 rotates the pinions 38 about their axes which are carried by the drum 39, and the pinions in turn by their rotation effect a rotation of the drum 26 by actuation of the internal gear 37, thus driving the drum 26 in a direction reverse to the direction in which it is driven from the gear 31. thermore, the planetary gearing which has been described as being made effective by the application of the brake band 40, is a change speed gearing, hence the reverse drive movement of the drum 26 for actuation of the cable 14 for racking in the dipper 2, is at a different speed dependent of course upon the gear ratios of the parts 41 and 37. The racking in operation may, of course, be stopped by throwing the lever 33 to its neutral osition whereby the releasing of the brake and 40 is effected.

It is notable that the right hand end of the drum 26, as viewed in Fig. 5, is formed with a flange 26 encircled by brake band means 26*. Since the drum 26 is adapted to be propelled in opposite directions it is desirable preliminary to its reversal of movement to have some means for braking its rotation, and to prevent the dipper from falling or racing when the boom is swung to and from the pointof discharge. The brake band means 26 may be availed of for the above purpose.

It is to be understood that I am not concerned particularly about the kind of connections provided intermediate the lever 33, or main operating controller for dipper- Fur-' Ill thrusting work, and the clutch mechanisms by which the operation of the cable thrusting drum 26 is reversibly effected. These connections may take so many different forms according to different constructions of shovels that they must necessarily be greatly modified at times for the above reason. have simply generally illustrated such connections, and they might be omitted entirely and diagrammatically denoted so far as the real gist of the present invention is concerned.

The special feature of the invention, of course, is the use of a single cable thrusting drum operable in reverse directions, one direction for crowding out, and the op osite direction for racking in the dipper. T e reversing mechanism, furthermore, may be at,

a difierent speed for the drum in one direc-' tion of its movement. Of course this reversing gearing may either produce a reduced speed of the drum, or an increased speed dependent upon the requirements of service.

Reverting now to the disposition of the pulleys 27 carried by the bracket members 28, it is to be observed that the peripheries of these pulleys are adapted to travel in a path which substantially intersects the axis of the boom C, as established by the pivot 7. For

this reason it will be apparent that the cable means is So located in its travel that inward and outward movement of the boom G in relation to the crane body under the control of the cable 5 may be effected at will during operation of the cable 14 for racking in the dipper, as well as for crowding out the same.

Under ractical conditions of service, I have found the combined actions above specified, to result in a much increased efficiency of the shovel, and no matter what the position of the boom C may be, or its movement under operating conditions, the tension of the thrusting cable 14 will not be changed whatever.

The bucket or dipper hoisting cable 4 after passin over the sheave at the top of the boom extends to the hoisting drum 3 by passing between the side members of the di per handle.

I-Iaving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In a power shovel, in combination, a boom, a dipper shovel mounted thereon and comprising a handle, shi per mechanism mounted on said boom, ca le thrust meams cooperating with said shipper mechanism, and means for efiecting bodily adjustment of the shipper mechanism relatively to the boom for taking up slack in the cable thrust means.

2. In a power operated shovel crane, in combination, a body, a dipper shovel mounted thereon, shipper mechanism for crowding out and racking in said shovel, a cable thrust mechanism for actuating said shipper mechanism comprising a drum, cable means Wound about said drum in opposite directions and operatively connected with said shipper mechanism, means for reversibly operating said drum, and means included in said reversible operating means whereby the drum will be rotated at greater speed in one direction than the other.

3. A machine as set forth in claim 2, wherein the cable means is wound around the drum from the ends of the latter toward the center so that as one part of the cable unwinds from the drum' the other part will wind thereon and occupy the space previously occupied by the unwound portion.

4. In a power operated shovel crane, in combination, a swing body, a boom thereon, a dipper shovel mounted on said boom and comprising a dipper and a dipper handle, shipper mechanism on the boom for crowding the dipper handle out, and racking in the same, cable thrust mechanism for said shipper mechanism comprising a cable thrust drum carried by the swing body, power mechanism on the swing body, means for transmitting movement to the drum in one direction fro'm saidpower mechanism, means for transmitting movement from said power mechanism to said drum for driving the latter in an opposite direction at a different speed from that first mentioned, and cable means connecting the said drum with the shipper mechanism on the boom.

5. In a power operated shovel crane, in combination, a swing body, a boom thereon, a dipper shovel mounted on said boom and comprising a dipper and a dipper handle, shipper mechanism on the boom for crowding the dipper handle out, and racking in the same, cable thrust mechanism for said shipper mechanism comprising a cable thrust drum carried by the swing body, power mechanism on the swing body, means for transmitting movement to the drum in one direction from said power mechanism, means for transmitting movement to said drum for driving the latter in an opposite direction at a different speed from that first mentioned, and cable means connecting the said drum with the shipper mechanism on the boom, said cable means including cable parts wound on the drum from the ends of the latter toward the middle and passing in opposite directions about the drum, the shipper mechanism also including a drum about which said cable means winds in opposite directions.

6. In a power operated shovel crane, in combination. a dipper shovel comprising a dipper, a dipper handle, shipper mechanism for crowding out the said handle and racking in the same, cable thrust mechanism connected to said shipper mechanism and comprising a shaft, a drum mounted on said shaft, a sin le cable connection between the drum and s ipper mechanism, clutch mechanism for directly connecting the shaft with the said drum for operating the latter in one direction, and other clutch mechanism for reversibly connecting said shaft with said drum to operate it in an opposite direction.

7. In a power shovel, in combination, a boom, a dipper shovel mounted thereon and comprising a handle, shipper mechanism mounted on the boom, and including a shaft, a shipper drum on the shaft, cable thrust means including a cable Wound about said shipper drum, and a manually operable adjusting device carried by the boom and operatively connected with the shipper mechanism for adjusting the position of the latter to take up slack in the cable aforesaid.

8. In a power operated shovel crane, in combination, a dipper shovel comprising a dipper, a dipper handle, shipper mechanism for crowding out the said handle and racking in the same, cable thrust mechanism connected to said shipper mechanism and comprising a shaft, a drum mounted on said shaft, clutch mechanism for directly connecting the shaft with the said drum for operating the latter in one direction, and other clutch ,mechanism for reversibly connecting said shaft with said drum for operating the latter in one direction, with a different speed of movement of the drum.

9. In a power shovel, in combination, a boom, shipper mechanism mounted on the boom comprising a shaft and shipper drum thereon, hearings in which said shaft is mounted, cable thrust mechanism for operating the drum of the shipper mechanism and including a cable connected with said drum, and an adjusting device including screw shaft means connected with said bearings for the shipper shaft, and a manually operating device for the screw shaft means to actuate the latter to move the said bearings for taking up slack in the cable aforesaid.

10. In a power operated shovel crane, in combination, a dipper shovel comprising a dipper, a dipper handle, shipper mechanism or crowding out the said handle and racking in the same comprising a shipper shaft and operating drum thereon, cable thrust mechanism connected to said shipper mechanism and comprising a shaft, a drum mounted on said shaft, clutch mechanism for directly connecting the shaft with the said drum for operating the latter in one direction, and other clutch mechanismfor reversibly connecting said shaft with said drum to operate it in an opposite direction, a control 7 device for operating said clutch mechanisms,' and a single cable connecting the two drums to transmit the movement of the second drum to the first drum.

11. In a power operated shovel crane, in

combination, a body, a dipper shovel mounted thereon, shipper mechanism for crowding out and racking in saidshovel including shipper drum, a cable thrust mechanism for actuating said shipper mechanism comprising a main operating drum, cable means connecting and wound about said drums in opposite directions, a driving connection between the shipper drum and the dipper other than the cable means and means for reversibly operating said main operating drum.

12. In a power operating shovel crane, in combination, a dip r shovel comprising a dipper, shipper mec anism for crowding out and racking in the dipper, cable thrust means connected to said shipper mechanism comprising a cable, a drum, a plurality of clutch means for operating the drum in one direction at one speed and in the opposite direction at a different speed, and a single manual control device controlling said clutch mechanisms.

13. In a power operated shovel crane, in combination, a boom, a dipper shovel mounted thereon and comprising a dipper handle, shipper shaft mechanism including a shipper shaft, a shipper drum thereon, cable thrust means co-operating with said drum, and means co-operative with the shipper shaft for taking up the slack in the cable thrust means.

14. In a power operated shovel crane, in combination, a crane bod a boom thereon a dipper shovel carried y said boom, and means connecting the boom with the body aforesaid including brackets attached to the lower end of the boom and. diverging in opposite directions downwardly and outwardly from said lower end, with pivotal connections between said brackets and body establishing a substantially horizontal axis for the boom, the diverging brackets providing a space therebetween and cable guiding sheaves arranged in said space and having their guide peripheries revolving in a plane approximately intersecting the axis aforesaid, shipper mechanism on the boom and cable thrust means on the crane body including a cable operating over said sheaves and connected with the shipper mechanism on the boom. 4

15. In a crane of the class described, in combination a crane body, a boom pivotally mounted thereon'and comprising diverging bracket members at its base, pivotal connections between said bracket members and the crane body, pulleys mounted on the foot of the boom between said bracket members and having their peripheries operating substantially in a path intersecting the axis of the boom, a driving drum mechanism on the crane bod including a thrusting drum, a shipper sha t and drum mechanism on the boom, a dipper shovel carried by the boom drum in opposite directions and operable by said shipper shaft and drum mechanism, a thrusting cable means for racking in and crowding out the dipper shovel operable by said drum mechanism on the crane body, connected with the shipper shaft and drum mechanism on the boom and leading over the pulleys at the foot of the boom so that it travels in a path intersecting the axis of the boom together with means for peaking the boom in and out at will during the operation of the dipper shovel by said thrusting cable means.

16. In a power shovel, the new combination of a crane body, a boom carried thereby, a dipper mounted on said boom and comrismg a dipper handle movable long1tu:

'nally for crowding and racking in movements, shipper shaft mechanism on the boom cooperating with the dipper handle to moye the latter for crowding and rackin in action, said mechanism comprising a single drum operating member, and operating means on the crane body for actuating the said drum on the boom and consisting of a single operating drum, connecting means between the shipper mechanism drum of the boom and the operatin drum of the crane body consisting of a ca le wound about the shipper mechanism drum in opposite directions and led to the operating and wound about the latter in op osite directions with means for turning t e operating to impart through said cable corresponding movement to the shipper mechanism drum, the said cable in being attached to its drums aforesaid being wound about each of the sald drums from the middle portion thereof outwardly so that as a portion of the cable unwinds from the the end the other portion of the cable will wind on to the space of the drum previously occupied by the unwinding portion of the cable.

17 In a device of the class described, a frame having a boom mounted at the forward end thereof, a dipper rovided with a handle having a rack and pinion connection with said boom a hydrocarbon motor at the rear end of said frame, flexible cable means connected to said dipper and extending over a sheave carried by said boom, a drum for said cable means mounted forwardly of said motor, a second drum at the front of said frame provided with flexible draft connection wlth said rack and pinion means to drive said means in opposite directions, and reversible power connection for said last named means.

18. In a power operated shovel crane, in combination, a dipper shovel comprising a dipper, a dipper handle, shipper mechanism for crowding out the said handle and racking in the same, cable thrust mechanism connected to said shipper mechanism and comdrumat the middle toward prising a shaft, a drum mounted on said shaft, a single cable connection between the drum and shipper mechanism, clutch mechanism for directly connecting the shaft with the said drum for operating the latter in one direction, and other clutch mechanism for reversibly connecting said shaft with said drum to o erate it in an opposite direction, and a bra e coacting with said drum to arrest its movement.

19. A shovel crane comprising a portable base and a swim body mounted thereon, together with a siiovel boom carried by the swing body, a dipper mounted upon the shovel boom and comprising a dipper handle, operating mechanism on the swin body including a hoisting drum connecte with the shovel boom for raising and lowering the same, dipper operating mechanism on the swing body including an operating drum, means for reversely actuating said operating drum, means for applying braking eilects to said operating drum, the dipper operating means including shipper mechanism mounted upon the boom and comprising a ship or drum, and cable means arranged to win in opposite directions about the operating drum on the swing body, and also in opposite directions about the shipper drum on the boom, guiding means on the boom adjacent to its point of support for guiding the cable means running from the o crating drum on the swing bod to the ship r drum, said cable means an the drums a out which it passes being arran d substantially centrally and longitudinal y of the boom whereby the stresses set up in the operating of the cable means are central in relation to the boom and in relation to the dipper means mounted thereon.

20. A crane comprising a swin 'n platform, a boom pivotally mounted tfiereon, crowding mechanism on the boom including a reversible drum, a dipper having a dipper stick arranged in cooperation with the crowding mechanism on the boom, an en ine on the swin ing platform, hoisting mec anism operable y said engine and connected with the dipper for actuation thereof, an operating drum on the platform, cable thrust means operable by the engine and winding about said drums in opposite directions, means for reversibly operating the operating drum, and means to guide the said cable means last referred to and arranged adjacent to the point of pivotal mounting of the boom on the platform.

21. In a crane of the class described comprisin a traction base, a swing body thereon, a com pivotall mounted on the swing body, hoisting mec anism for raising and lowering the boom carried by the body, a dipper comprising a dipper stick and mounted uppn the boom, a shipper cable drum carried y the boom for crowding out and racking in the dipper, a reversible drum carried by the body for actuating the shipper cable drum, cable means winding in opposite directions about said reversible drum and connected with the shipper cable drum to' positively drive the latter for actuating the same 'body, a boom pivotally mounted thereon,

hoisting mechanism for raising and lowering the boom carried by the body, a dipper comprising a dipper stick and mounted upon the boom, shipper mechanism carried b the boom for crowding out and pulling in the dipper, a reversible drum carried by the bod cab e means windin in opposite directions about said reversib e drum and connected with the shipper mechanism 'for actuating the same to o erate the dipper, an engine on the body ibr operating said reversible drum and means to arrest the operation of the reversible drum at will, comprising a brake coacting with said drum, and the single manual control means governing the action of the reversible drum in opposite di rections, the reversible drum and the shippei mechanism on the boom being in substan tial ali nment and the boom being provided centralIy thereof and adjacent to its pivotal connection with the body with guidin; means for said cable means.

In testimony whereof I afiix my signaturev LESLIE A. RUSSELL.

for actuating the shipper mechanism, 80

ing in the dipper, a reversible drum carried bod for actuating the shipper mechanism, 90 by the body for actuating the shipper cable cab e means windl in opposite directions drum, cable means winding in opposite diabout said reversibfia drum and connected rections about said reversible drum and conwith the shipper mechanism for actuating 5 nected with the shipper cable drum to posithe same to o crate the dipper, an engine tively drive the latter for actuating the same on the body or operating said reversible 26 to operate the dipper, thrust means for the drum and means to arrest the operation of dipper operated by the shipper drum, an the reversible drum at will, comprising a engine on the body swing for operating said brake coacting with said drum, and the reversible drum, and means to arrest the opsingle manual control means governing the eration of the reversible drum at will. action of the reversible drum in opposite di 22. In a crane of the class described, a rections, the reversible drum and the shipper body, a boom pivotally mounted thereon, mechanism on the boom being in substan hoisting mechanism for raising and lowering tial ali nment and the boom being provided 15 the boom carried by the body, a dipper comcentrally thereof and adjacent to its pivotal prising a dipper stick and mounted upon the connection with the body with guidin; boom, shipper mechanism carried b the means for said cable means. boom for crowding out and pulling in the In testimony whereof I aflix my signature dipper, a reversible drum carried by the LESLIE A. RUSSELL.

CERTIFICATE or connecnon. M... No. 1.639.752. omits August 23, 1921. to

issue A. RUSSELL.

It is hereby certified that error appears in the printed specification of vthe sbovc nnmbcrcd patent requiring correction as follows: Page 2, line 39, for the word "Figure" rcsd "Figures"; page 4, lines 127 and 128, clsim 6, pigs 5, lines 23 sml'8l, claims 8 and 12, and page 6,. lines 63 and 64, clsim 18, for word "rscliing" rcsd "pulling"; page 5, line 86, claim 12, strike out "at a different speed"; page 7, line 9, claim 2], strike out the word swing and insert the came before the word "body" in the same line; sod "M the sold Letters Patent should be read with these corrections therein that the suns III! conform' to the record of the case in the Patent Office.

Signed and scaled this 25th dsy of October, A.- D. 1927.

0 Jo m". Scsi. Acting Gomissioncr of. Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1.639.752. Granted Anguat 23, 1927, to

LESLIE A. RUSSELL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 39, for the word "Figure" read "Figures"; page 4, lines 121 and 128. claim 6, page 5, lines 23 and8l, claims 8 and 12, and page 6,. lines 63 and 64, claim l8,'for word "racl'ting" read "pulling"; page 5, line 86, claim 12, strike out the words "at a different speed"; page 7, line 9, claim 21, strike out the word "swing" and insert the same before the word "body" in the same line; and that the said Letters Patent should be read with theae corrections therein that the same may conform'to the record of the case in the Patent Office.

Signed and eealed this 25th day of October, A. D. 1927.

ll. .1. Moore, Seal. Acting Conniaaioner ofv Patents. 

